It does tap itself for its effect so Collector's Vault only benefits once per turn unless you have ways to untap it before your normal untap step
If a card is good enough to be in contention for the best card in Magics second-most-powerful format, its bound to make waves in Historic as well
Opening packs and achieving particular mastery levels reward wild cards tied to Magics different rarities: common, uncommon, rare, and mythic
Glossing over the fact that it seems this fellow has no clothes on, Deranged Hermit is a powerhouse Squirrel lord, and it has never been reprinted in an actual expansion meaning the Urzas Legacy printing at close to $60 is the most cost-effective way to obtain this card in todays market
Sorcery speed Village Rites for three makes the black one pretty playable, but the other two I think are less exciting
Squall, SeeD Mercenary Squall, SeeD Mercenary is in excellent knight colors and has a powerful mini-Sun Titan effect that works perfectly with Orzhov cards